Kate reveals her bump as she makes her first appearance since announcing her pregnancy to host royal reception

The Duchess of Cambridge tonight made her first public appearance since announcing her pregnancy last month.

The 35-year-old royal, who has not been seen in public since August 30, joined Prince William, 35, and Prince Harry, 33, to host a glittering Buckingham Palace reception recognising the work of mental health workers.

The mother-to-be looked radiant in a £795 powder blue dress by Temperley London which showed just the smallest hint of a baby bump.

Kate, who is understood to have a due date in spring, has not attended an official engagement for six weeks after being struck down by the same severe strand of morning sickness that she suffered while pregnant with Prince George, four, and Princess Charlotte.

An aide revealed tonight that the duchess is still suffering from hyperemesis gravidarum (HG) but said her condition is improving.